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Point of Serialization location

ARM AXI 5 reference manual says - 

Multi-copy atomicity can be ensured by:
• Using a single Point of Serialization (PoS) for a given address, so that all accesses to the same location are ordered. This must ensure that all coherent cached copies of a location are invalidated before the new value
of the location is made visible to any agents

Where is the Point of Serialization in a typical AMBA 5 based SoC? Is it the interconnect?